Firefighter Doherty rescues Doc and Carlos from a burning building.

A car chase ends in a fiery crash; Bosco attends the opera with his girlfriend.

Firefighters battle a motel inferno while officers search for the arsonist.

Crews search for a toddler who wandered off after an accident.

Doherty climbs into an industrial mixer to rescue a trapped worker.

Crews camp backstage during a senatorial debate between the first lady and the mayor.

Doc and Carlos argue over how to handle a young street tough.

Davis mistakenly shoots an African-American man helping a downed Sully.

A gunman opens fire at a gay wedding ceremony; two young women steal a car.

The streets become a war zone when Yokas and Bosco pursue a gang of robbers.

Bobby helps his ex-con brother; Doc hospitalizes his crotchety father; a loan shark stalks Doherty.

Sullivan copes with a friend's death; Bobby tries to heal old wounds at home.

Rescue crews race to save lives after a building collapses on demolition workers.

Rescue crews must demolish walls to extricate an extremely obese woman from her home.

Boscorelli attempts to settle a feud between families on Thanksgiving.

Carlos' rig accidentally hits a pregnant woman; Bosco looks for a suspect.

Doherty risks his life when a rookie is lost inside a burning building.

Yokas surprises Bosco with her method of dealing with a gang member.

Davis meets a young rape victim; a teenage prostitute victimizes Kim.

The "feud" between Doherty and Bosco escalates; a watch's owner is sought.

The shooting of paramedic Jerry has Doc, Ty, and Carlos feeling guilty; Ty questions Sully about his father's death; A worried Jimmy gives ex-wife Kim a bulletproof vest; Fred wants Faith to quit her job.

Ty Davis becomes a policeman like his father and Carlos becomes a paramedic. The two recruits work with older, wiser partners. Carlos works with the serious Monty "Doc" Parker and Ty works with John "Sully" Sullivan, his father's old partner. Meanwhile paramedics Bobby and Kim rush from emergency to emergency; officers Bosco and Yokas and firefighter Jimmy have other problems to deal with.